Abstract: Substation construction as one of the key points of power transmission and transformation project, the stability of slope is the key to ensure the safe operation of substation.The stability analysis and support scheme research of high excavation and deep filling slope are technical difficulties to be solved.In order to ensure a high substation digging deep to fill slope stability, avoid the negative impact of the slope deformation and destruction caused by field engineering geological survey and geological prospecting way to expose engineering geological characteristics in jobsite, dig deep fill slope geological model is set up on high, the rigid body limit equilibrium and finite element numerical simulation to conduct quantitative calculation,The appropriate treatment measures are put forward for the slope whose safety factor fails to meet the requirements of the code.